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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e27834c3467e53a8ac77a506e6b28d86f06120925c8280e4a7916bc2d50778c' 
  AND token = '6PxlbLM4ZwlaIf+aLlw8YhBl1gcpzBtPIuofloFqGpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}